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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a92e9d8f018d72e8ebde9a35b493f95e598ca7687a01367b5b8c863bde5b37' 
  AND token = '1xJESHa0hJ2mzI0mv7rDu0q8wTVWOxPcz8+4Poes1/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}